The invention belongs to the model facility of hydraulics experiment, and specifically relates to a device for stable, high-speed and variable-angle water entry experiment of rotating body, comprising a transparent water tank, a data acquisition system which the connection is controlled by the industrial personal computer as well as a release device of water entry objects arranged above the transparent water tank, the release device of water entry objects comprises an entry angle protractor and a gas guide rod under flexible connection with a horizontal bracing piece, the bottom sleeve connection of the gas guide rod is arranged with the rotary gear and rotating head motor under coordination with the rotary gear, the motor operation drivers the rotation of the water entry objects. The gas guide rod is under sealed connection with a gas supply device via the high-pressure windpipe, the gas supply device comprises a high-pressure gas cylinder with the electro-magnetic switch valve and a air compressor connecting to the high-pressure gas cylinder, negative or positive pressure is formed in the high-pressure gas cylinder by controlling the operation of the air compressor, so as to control absorption and high-speed release of the water entry objects. The device for stable, high-speed and variable-angle water entry experiment of rotating body can stably release different forms of water entry objects under high-speed rotation at high speed, and can accurately control the object entry angle.